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The error, "Secure VPN connection terminated locally by the Client. Reason 412. The remote peer is no longer responding". Means that the software VPN Client detected that the VPN server is not responding anymore and deleted the connection. Now, this is caused by several different issues, for example:

The User, is behind a firewall that is blocking UDP 4500/500 and/or ESP.

The VPN client is using connecting on TCP and that is blocked.

The internet connection is not good and some pkts are not reaching the VPN concentrator/server or the replies fromthe server/concentrator aren't getting to the

client, hence the client thinks the server is no longer available.

The VPN client is behind a NAT device and the VPN Server doesn't have NAT-T enabled. In

this case the user will not be able to send or receive traffic at all. It will be able to

connect but that's all. After some time the Software client deletes the VPN tunnel.

I have had this issue as well. I have also recreated with client on a switch port next door to ASA's Outside interface. So no Firewall/NAT-T, etc. Although those are all valid reasons for the error 412, sometimes the 412 kicks off and can't explain. Most of the time I believe it has to do with congested lines or the connection dropping too much traffic for whatever reason.

This may not be a problem with the client side at all, but with the firewall configuration itself. I had this same error code and it turned out to be a problem with a NAT statement on the ASA I was trying to VPN to.